use discord_webhook_rs::Webhook;
use regex::Regex;
use std::env;
use time::macros::format_description;
use time::{Date, OffsetDateTime};

fn main() {
    dotenvy::dotenv().expect("Need a .env file");

    let doc_url = env::var("DOC_URL").expect("Missing DOC_URL in .env");
    let webhook = env::var("WEBHOOK_URL").expect("Missing WEBHOOK_URL in .env");

    let body = reqwest::blocking::get(doc_url + "/export?gid=0&format=txt")
        .unwrap()
        .text()
        .expect("Google doc download failed!");

    let announcement_matcher = Regex::new(r"(\w+day,? \w+ \d+) *((?:.|\n)+?)\n\w+day").unwrap();

    let last_announcement = announcement_matcher.captures_iter(&body).next().unwrap();

    let date = last_announcement.get(1).unwrap().as_str().replace(",", "");

    let announcements = last_announcement
        .get(2)
        .unwrap()
        .as_str()
        .trim()
        .replace("\n\n", "\n");

    let description = &format_description!("[weekday] [month repr:long] [day] [year]");
    let parsed_date = Date::parse(&format!("{} 2025", date), description).unwrap();
    println!("Date: {:}", parsed_date);

    if OffsetDateTime::now_utc().date() != parsed_date {
        println!("Last date is not today!");
        return;
    }

    Webhook::new(webhook)
        .content(&format!("## {}:\n{}", date, announcements))
        .send()
        .unwrap();
}